Saw tooth



July 7, 1925.

W. H. B. PERRY SAW TOOTH Filed June 14. 1924 INVENTOI? W175 139/? WITNESSES Patented July 7, 1925.,

UNITED STATES v p v 1,545,448} PATENT- oFFlcE. l

, WILLIAM H. B. PERRY, or WA'rERBURY, vnnmonr.

. 1 1! saw. room.

Application filed June 14, 1924. Serial No. 720,014.

To all whom it may concern:

Be it known that I, WILLIAM H. B. PERRY, a citizen of theUnited States, and a resident of WVaterbury, in the countyof WVashington 5 and State of Vermont, have invented a new and Improved Saw Tooth, of which the fol lowing is a full, clear, and exact description.

This invention relates to an improvement in saw teeth, with particular reference to teeth for use in stone-cutting apparatus.

An object of the invention is to provide a simple, efiicient strongand durable tooth construction which is capable of ready attachment toand detachment from a saw blade of any type. V v M Another object concernsthe provision of means whereby the teeth do not have to be replaced at nearly such frequent intervals as has been the case because ofthe automatic action of the tooth itself in furnishing a fresh cutting edge when one cutting edge has worn out.

A further object concerns the provision of means whereby the cutting action is rendered more efficient and'rapid by reason of the provision of a plurality of cutting surfaces.

The invention is illustrated in the drawings, of which- Figure 1 is a side elevation of a portion of a saw blade showing certain teeth attached thereto; F Fig. 2 is a section taken on the line 2-2 of gig. 3 is a plan view of one of the teeth; an

Fig. 4 is a partial elevation of a modified cerns the provision of a tooth, preferably hollow and elongated in cross section, which is provided with a cutting edge, preferably along one edge but possibly provided with cutting edges at both the front and rear, this tooth being slotted at intervals through either or both cutting faces so-that as the cutting edge Wears away the edge adjacent the nearest slot will break off, presenting a fresh cutting edge, which in turn will gradually Wear away and break off, so that successive cutting edges are freshly presented, thus not requiring the replacement of a new tooth every time the cutting edge becomes useless. v i

A further aspect of the invention con'- cerns the provision ofa plurality of project ing lugs or teeth on'the saw blade'whic-h are adapted to be insertedinto the end of the hollow cutting toothfand,by reason of align ing apertures in the teeth, can be riveted together or otherwise fastened.

A still further aspect of the invention c0ncernsthat' factthat by reason of the hollow ness of the tooth. two cutting edges are presented which wear, into the stone along spaced lines between which on the stone a ridge of material'is formed which gradually crumbles away due to the vibration. This permits a Wider cut to be made with a minimuniamount of cutting edge and in the same period of time. p,

Furthermore, the invention is susceptible of providing'a tooth both front and rear faces of which can be provided throughout their, length with spaced slits to form tongues which, as they are gradually worn away by the cutting action, will break off. Furthermore, the fact that the tooth is hollow enables it to be fastened readily to the saw blade to provide an efficient cutting surface and at the same time remains light in weight so that higher speeds are possible than with a solid tooth.

In the preferred form of the invention shown in the drawings 1 or 1 represents the body of the saw blade, which may be a straight blade or a curved blade. This blade is provided throughout its periphery with a plurality of projections or teeth such as 2 between which slots 3 are formed.

The cutting teeth are designated by the numeral 4 and are preferably hollow, hav ing preferably an elongated elliptical cross section, as shown in Fig. 3, the lateral walls ofthe tooth being separated by a hollow space 5.

Along either the front or the rear face, or

both, of the tooth a plurality oftongues '6 108' may be formed, these tongues produced by slitting the tooth at spaced distances along its length from the cutting edge 7, either at thefi'ont or rear or hot These slits are designated the numeral 8; Preferably 110 the slots are disposed par-allelto the angle of the cutting edge 7 so that as the firstgand lowermost tongue wears away it will break ofi during the operation ofthe machine and a new cutting edge will: be presented. c a The teeth or projections 2 are provided with apertures 9 which are adapted to be aligned with apertures in the teethfl so that rivets or other fasteningnieans' such as 10" can hold-the tooth to the projection when the tooth is slipped on to the projection. By thismeans of connection teeth can be readily attached to and detached from the blade either of the straight or "rotar'y type. a

i As shown in Fig. 2, the spaced Walls or the tooth as they out along the edges 7 will result in a ridge being formed between them inthestone at the bottom of the cut. 'However, thi'sridge will crumble or break down, due' to the rapid vibration to which the stone is 'subjected, so that with only the two thin cutting walls spaced apart alwide'r out can be made in the same time. By having the shtsprov ded on both the front andcrear faces" oli'the tooth, especially shown in Fig. 1, the saw blade can be moved in either direction. This same construction, of course, isapplicable to the teeth as a'p'plied; to a rotary blade. v.

'-It is obviousthat I have ,provided'a siniple andefficient form of tooth and aparticularlysimple ni'anner for attaching it to a blade whereby it can be readily attached and detached. This tooth is especially efficient with regard to" the size and speed of cutting regard to the lengthvof re lacement.

,7 liptical cross section and front faces, said tooth having a plurality of slits disposed at spaced intervals throughout the 3. In combination, a saw blade having a plurality of n projections, hollow saw teeth each adapted'to have one end slipped over a projection, and ineans for fastening the teeth to the projections. I V

4. In combination, a saw blade having an elongated projection, a hollow tooth having a similar elongated. cross section adapted to be, slipped over theprojectioln'and means for fastening the tooth to the projection.

5. new tooth having an elongated e1 liptical cross section and front and rear faces, said tooth having a a plurality of slits disposedjat spaced intervals throughout'the length of eachface. b

6. A sawtooth havingan elongated "e1 length of each face, said slits being arranged at spaced intervals and, parallel to the out ting edge at the bottom of each face.

Y :WILLI'AM BPERRY.

and rear 1 

